gnupic: Re: [gnupic] About a USB programmer I found
Subject:
Re: [gnupic] About a USB programmer I found
From:
Pierre GAUFILLET ####@####.####
Date:
21 Aug 2006 20:40:41 +0100
Message-Id: <44EA0B2E.5070904@magic.fr>
####@####.#### a écrit :
>> Hi,
>>
>> you could also have a look at http://vasco.gforge.enseeiht.fr
>>
>> Vasco project includes a 18F4550 USB bootloader (PUF - PIC USB
>> Framework), a parallel port programmer schematic (you will need it for
>> the first bootloader upload at least), and a basic 18F4550 board
>> schematic.
>>
>>
>> Pierre
>>
>
> Hello,
>
> Thanks, the whole package compiled on my computer quite cleanly. Just one thing about it:
>
> On demo-1.0, the file src/main.cxx, line 37:
>
> string cmd;
>
> I haven't made use of cscope to see where it comes from. As I didn't see it being used on main.cxx, I just commented that line and it compiled.
>
You are right. Compiling and linking are ok on my machine, but this line
should not be here. To be fixed...
> About the rest, I'm a bit confused. I don't understand why a bootloader as the one pointed out by Byron is suitable for uploading a hex bootfile to a chip, but then I need a programmer to do the same. So if I want to get on with your project pierre I might need to buy a programmer anyway? Isn't it possible to use the generated bootfile with such a bootloader?
>
As BAJ said, whatever the solution you choose, you still need a
programmer (of course this programmer can be connected to your PC
parallel or USB port) to upload at least once the bootloader.
When the bootloader has been flashed into your uC, you can program the
PIC without a programmer : the PIC itself will do it through its USB
interface.
> Today I've been looking for prices on programmers, I can't get them cheaper than about 60 euros, which I find really expensive.
>
In fact it is quite easy and unexpensive to build your own one (30€ ?),
at least for a parallel port programmer. See
http://gforge.enseeiht.fr/docman/view.php/10/203/vascoprog-20060108.zip
and http://gforge.enseeiht.fr/docman/view.php/10/220/low-img_1347.jpg.
This is the programmer I am actually using.
> I also wanted to ask about some books somebody could recommend me on this subject if possible.
> Kind Regards.
>
>
>
